CacheService.md

Cache service

What is a memory leak: after removing CacheService instance memory must be released

(function(window) {
  cache = []

  window.CacheService = function() {
    return {
      cache: function(value) {
        cache.push(new Array(1000).join('*'))
        cache.push(value)
      }
    }
  }
})(window)

var service = new window.CacheService()

for (let i=0; i < 99999; i++) {
  service.cache(i)
}

service = null

How to fix: move cache variable to CacheService scope like the followings:

(function(window) {
  window.CacheService = function() {
    var cache = []

    return {
      cache: function(value) {
        cache.push(new Array(1000).join('*'))
        cache.push(value)
      }
    }
  }
})(window)

var service = new window.CacheService()

for (let i=0; i < 99999; i++) {
  service.cache(i)
}

service = null